//TIP To <b>Run</b> code, press <shortcut actionId="Run"/> or
// click the <icon src="AllIcons.Actions.Execute"/> icon in the gutter.
public class Main {
    public static void main(String[] args) {
        int a = 10;
        int b = 20;
        sum(a, b);
//        System.out.println("a = " + a + " b = " + b);
    }
    public static void sum(int x, int y){
        int t = x;
        x = y;
        y = t;
        System.out.println("a = " + x + " b = " + y);
    }
}